Osmosis is the diffusion of water across a membrane in response to the concentration of one or more of the ______
A. solutes
B. membranes
C. compartments
D. cells
A
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Why do early successional stages harbor many r-selected species?
a. they often require shade b. they are long-lived c. they are not damaged by disturbances d. they produce many small seeds that colonize open areas e. they grow slowly
In the above figure, why does the curve sharply drop after approximately 45?C instead of mirroring the
slope of the line going from 0?40?C?
a. At high temperatures, the reactions proceed so quickly that enzymes are no longer helpful or required. b. This is true of all catalysts and is not due to any special features of enzymes. c. The kinetic energy of the reactants is so great that it destabilizes the enzyme and diminishes the enzyme's activity. d. The kinetic energy of the reactants is lower than that of the products, forcing a change in enzyme activity. e. The enzyme begins to denature above a certain temperature, eliminating all catalytic activity of the protein.
When a plant becomes infected by pathogenic bacteria or fungi, it may respond by way of a fight or
flight response – a defense that cordons off an infection site surrounding it with dead cells.
Indicate whether the statement is true or false.Where would you expect to find sapwood in a cross section of a tree trunk?
A. just before the periderm B. in the bark C. in the center D. in the roots E. just under the bark